"It took Hewlett-Packard less than a day to file a lawsuit against its former chief executive, Mark V. Hurd, over his decision to join its rival and partner Oracle as a co-president. H.P. filed its lawsuit on Tuesday in the Superior Court of California in Santa Clara, claiming that Mr. Hurd had breached his contract with the company. The lawsuit said that Mr. Hurd could use his intimate knowledge of H.P. and its trade secrets to aid Oracle and harm H.P. The two companies compete in the market for computer servers, storage systems and business software."